#include "iostream"
using namespace std;



//在默认参数规则 ，如果默认参数出现，那么右边的都必须有默认参数
void print(int a, int b, int x = 3, int y=4, int z = 5)
{
	cout << "=======" << endl;
	cout << "a:" << a << endl;
	cout << "b:" << b << endl;
	cout << "x:" << x << endl;
	cout << "y:" << y << endl;
	cout << "z:" << z << endl;

}




int main()
{
	print(1,2);
	print(1,2,99);
	
	return 0;
}